I am looking at getting a circular polarizer for my sony a100. I have a 50mm lens milnota 1.7f old film lens and a 55mm lens that came with my a100. I am going to get a step up ring so I can just buy a 55mm circular polarizer and use it on my 49mm. My question is, is there a big differnce in a digtial circular polarizer and a regular circular polarizer ? I know cost is one thing. Dose anyone have any pictures showing the differnce between the two types and which one would all of you get. If there is not a big difference between a Digtal and a regular then I will save the money, but if there is I would rather make my money better spent.